package com.zwh;
/**
 * Created by Administrator on 2017/10/10.
 */

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.Security;

/**
 * 3DES加密
 *
 * @author SHANHY(365384722@QQ.COM)
 * @date 2015-8-18
 */
public class ThreeDES {

    private static final String Algorithm = "DESede"; // 定义 加密算法,可用
    // DES,DESede,Blowfish

    /**
     * 加密方法
     *
     * @param key
     *            加密密钥，长度为24字节
     * @param str
     *            被加密的数据缓冲区（源）
     * @return
     * @author SHANHY
     * @date 2015-8-18
     */
    public static String encryptMode(String key, String str) {
        try {
            byte[] src = str.getBytes("GBK");
            // 生成密钥
            byte[] keybyte = key.getBytes("UTF-8");
            SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);

            // 加密
            Cipher c1 = Cipher.getInstance(Algorithm);
            c1.init(Cipher.ENCRYPT_MODE, deskey);
            System.out.println(c1.doFinal(src));
            return byte2hex(c1.doFinal(src));
        } catch (java.security.NoSuchAlgorithmException e1) {
            e1.printStackTrace();
        } catch (javax.crypto.NoSuchPaddingException e2) {
            e2.printStackTrace();
        } catch (Exception e3) {
            e3.printStackTrace();
        }
        return null;
    }

    /**
     * 解密
     *
     * @param key
     *            加密密钥，长度为24字节
     * @param str
     *            加密后的缓冲区
     * @return
     * @author SHANHY
     * @date 2015-8-18
     */
    public static byte[] decryptMode(String key, String str) {
        try {
            byte[] src = str.getBytes();
            System.out.println("byte:" + src);
            // 生成密钥
            byte[] keybyte = key.getBytes("UTF-8");
            SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);

            // 解密
            Cipher c1 = Cipher.getInstance(Algorithm);
            c1.init(Cipher.DECRYPT_MODE, deskey);
            return c1.doFinal(src);
        } catch (java.security.NoSuchAlgorithmException e1) {
            e1.printStackTrace();
        } catch (javax.crypto.NoSuchPaddingException e2) {
            e2.printStackTrace();
        } catch (Exception e3) {
            e3.printStackTrace();
        }
        return null;
    }

    /**
     * 转换成十六进制字符串
     *
     * @param b
     * @return
     * @author SHANHY
     * @date 2015-8-18
     */
    public static String byte2hex(byte[] b) {
        String hs = "";
        String stmp = "";

        for (int n = 0; n < b.length; n++) {
            stmp = (Integer.toHexString(b[n] & 0XFF));
            if (stmp.length() == 1)
                hs = hs + "0" + stmp;
            else
                hs = hs + stmp;
        }
        return hs.toUpperCase();
    }



    /**
     * 测试
     *
     * @param args
     * @author SHANHY
     * @date 2015-8-18
     */
    public static void main(String[] args) throws UnsupportedEncodingException {
        // 添加新安全算法,如果用JCE就要把它添加进去
        Security.addProvider(new com.sun.crypto.provider.SunJCE());

        // 24字节的密钥（我们可以取apk签名的指纹的前12个byte和后12个byte拼接在一起为我们的密钥）
        final String keyBytes = "588AA8D960FA4C4D8558BD72";
        String szSrc = "郭新胜";

        System.out.println("加密前的字符串:" + szSrc);

        String encoded = encryptMode(keyBytes, szSrc);
        System.out.println("加密后的字符串:" + encoded);

        byte[] srcBytes = decryptMode(keyBytes, encoded);
        System.out.println("解密后的字符串:" + (new String(srcBytes,"UTF-8")));
    }

}
